EP983 (N68M)

Classification

Country Section Category
CIS, Russia, Ukraine Corrosion-resistant alloys and steels Corrosion-resistant heat-resistant steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ti, % Ni, % Al, % Ce, % P, % C, % S, % Mo, % W, %
2–3 < 0.05 < 0.5 < 0.3 < 0.1 68.245–72.945 < 0.3 0.005 < 0.015 < 0.02 < 0.015 25–27 0.05–0.45

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ Cp, Дж/кг·К
20 202 12.4–16.7 456

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{Y}$$, $$MPa$$ d5, % Treatment
Round GOST 5949-75 40 Transverse raw, hot rolling, fat, Transverse 800–850 290–340 35–45

Magnetic properties

Rolling $$H_c$$, $$A/m$$
Round 1.522

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Round GOST 5949-18 annealing, hot rolling, fat, Transverse 300–350

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
no limits not sensitive loathsome

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Ti % Titan
Ni % Nickel
Al % Aluminium
Ce % Cerium
P % Phosphorus
C % Carbon
S % Sulfur
Mo % Molybdenum
W % Tungsten

Description of physical characteristics

Parameter Units of measurement Description
Cp Дж/кг·К Specific heat of material
$$E\cdot 10^{9}$$ $$MPa$$ Elastic modulus
$$\alpha\cdot 10^{6}$$ $$K^{-1}$$ Coefficient of thermal (linear) expansion (range 20°C–T)

Description of mechanical properties

Parameter Units of measurement Description
d5 % Elongation at break
$$\sigma_{Y}$$ $$MPa$$ Yield strength
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength

Description of magnetic properties

Parameter Units of measurement Description
$$H_c$$ $$A/m$$ Magnetic coercivity (not more)

Designation of types of weldability

Parameter Units of measurement Description
no limits Welding is performed without heating and without subsequent heat treatment
Boundedly welded Welding is possible with heating up to 100–120 °C and subsequent heat treatment
Difficult to weld For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing
Not applicable for welded structures